Added "Add repo" senario testing (#502)

* Adding start of add repository flow

* Adding data-cy instead of css selectors

* Saving progress

* Adding fixture data

* Cleaning the test

frontend/cypress/fixtures/example.json

@@ -0,0 +1,5 @@
+{
+  "name": "Using fixtures to represent data",
+  "email": "hello@cypress.io",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}